/Engine/Plugins/Animation/DeformerGraph/Source/OptimusCore/Public/IOptimusDataInterfaceProvider.h
Returns the index on the data interface that this pin on the node represents. E.g. for input pins, this would represent a write function on the data interface (andnotthe proposed pin definitions). NOTE: Only valid for top-level pins.
The index of the function on the data interface that this top-level pin represents, or INDEX_NONE if it doesn't represent a function (or if the pin isn't top-level).
int32 GetDataFunctionIndexFromPin ( const [UOptimusNodePin](API\Plugins\OptimusCore\UOptimusNodePin) * InPin ) const